Question

in C++

1. Write a definition for a class ‘point’ to describe a point with coordinates (X,Y) in 2-D space. The private data members are the coordinates X and Y of type ‘double’. The public member functions are:

• A default constructor (no parameters) to initialize X and Y to zero.
• An explicit value constructor with two parameters to initialize the values of X and Y.
• Two functions, one to set the X value and the other to set the Y value of a point.
• Two functions, one to return the X value and the other to return the Y value of a point.
• A function to return the distance from the point (X,Y) to another given point.

Implement all functions in line (inside the class header file)

2. Implement a user application function Maxpoint that uses the point class:

The function receives an array of points A of length N and returns the index of the point having the maximum distance from the origin (0.0, 0.0).

Answer 1

#include <iostream>
#include <string>
#include <cmath>
using namespace std;
class point{
  public:
  double x;
  double y;
  point(){
      x=0;
      y=0;
  }
  point(int x1,int y1){
      x=x1;
      y=y1;
  }
  void setX(int x1){
      x=x1;
  }
  void setY(int y1){
      y=y1;
  }
  double getX(){
      return x;
  }
  double getY(){
      return y;
  }
  double distance(){
      return sqrt(x*x+y*y);
  }
   
};
int Maxpoint(int arr[][2]){
    int len=4;
    double d[len];
    for(int i=0;i<len;i++){
        point p(arr[i][0],arr[i][1]);
        d[i]=p.distance();
    }
    double max=d[0];
    int index;
    for(int i=0;i<len;i++){
        if(max<d[i]){
            max=d[i];
            index=i;
        }
    }
    return index;
}
int main()
{ 
    int a[4][2];
    a[0][0]=5;
    a[0][1]=6;
    a[1][0]=8;
    a[1][1]=7;
     a[2][0]=9;
    a[2][1]=8;
     a[3][0]=3;
    a[3][1]=4;
    cout<<"The index of the point having the maximum distance from the origin (0.0, 0.0) is: "<<Maxpoint(a);
    return 0;
}

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